The occurrence of Pseudomonas aeruginosa in fleece washings from sheep affected and unaffected with fleece rot

Kingsford, N.M.; Raadsma, Herman W.

doi:10.1016/s0378-1135(96)01287-4

Cited by 13 publications

(16 citation statements)

References 20 publications

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“…During March and April, the climate becomes warmer and the fly population increases. This supports previous observations on the importance of moisture in disease susceptibility 1,2 . The role of flies in the transmission of this disease 2 in Jordan requires further assessment.…”

Section: Discussionsupporting

confidence: 90%

“…P. aeruginosa infection is associated with increased severity of fleece rot and subsequent flystrike, and the potentially important role of this organism must be considered in diagnostic studies and in control strategies such as vaccination. 2 Experimental cutaneous inoculation with P. aeruginosa induced a green discoloration of the fleece of sheep kept under wet conditions, whereas animals housed under dry conditions showed no signs of dermatitis. 1 This coloration was associated with copious serous exudation in the fleece rot lesion and with the formation of micro-abscesses.…”

Section: Introductionmentioning

confidence: 99%

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Isolation and characterization of Pseudomonas aeruginosa from sheep with fleece rot in northern and middle Jordan

El-Sukhon

2002

Veterinary Dermatology

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A total of 162 sheep fleece samples were collected from 2315 sheep clinically examined for evidence of dermatitis. The sheep belonged to 32 flocks raised in northern and middle Jordan. Eighty-three samples showed no obvious abnormalities, whereas the remainder showed exudation (79 samples), fleece discoloration (18) and fleece roughness (40) and abscesses (7). Seventeen Pseudomonas aeruginosa isolates were obtained from these samples. Antibacterial resistance in vitro was common; resistance to tetracycline, amoxycillin, erythromycin and cotrimoxazole was shown by > 90% of the isolates. Resistance to norfloxacin (29.4% of isolates), ciprofloxacin (17.6%) and amikacin (17.6%) was also demonstrated. Fourteen isolates were serum resistant when assessed after 1-3 h incubation in sheep and calf sera, and their count increased by 2-2.9 and 2.5-3.5 respectively.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Isolation and characterization of Pseudomonas aeruginosa from sheep with fleece rot in northern and middle Jordan

El-Sukhon

2002

Veterinary Dermatology

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“…This was confirmed by the alteration of the normal growth profile of Pseudomonas aeruginosa. Furthermore, the SEM study showed that the extract could completely collapse the bacterial cells and inhibit the growth of the Pseudomonas aeruginosa, which orgenism can cause urinary and respiratory system infections (Tetsuro & Tetsuro, 2004), dermatitis, soft tissue infections, bacteremia (Kingsford & Raadsma, 1997), bone and joint infections, and gastrointestinal infections (Hellen, 2000).…”

Section: Discussionmentioning

confidence: 99%

Antibacterial Activity and Toxicity ofPsophocarpus tetragonolobus.

Latha

Sasidharan

Zakaria

et al. 2007

Pharmaceutical Biology

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A methanol extract of the Psophocarpus tetragonolobus (L.) DC (Leguminosae) leaves was screened for antimicrobial activity against Pseudomonas aeruginosa. Antimicrobial tests were carried out using the disk diffusion assay and broth dilution method against Pseudomonas aeruginosa. The extract showed favorable antimicrobial activity against Pseudomonas aeruginosa with a minimum inhibitory concentration (MIC) value of 2.55 mg=mL. Apart from the antibacterial effects, imaging using scanning electron microscopy (SEM) was done to determine the major alterations in the microstructure of the Pseudomonas aeruginosa. The main abnormalities noted via SEM studies were alterations in morphology and complete collapse of the bacterial cells after 36 h of exposure to the extract. The effect of the extract on the growth profile of the bacteria was also examined. The extract changed the normal growth profile of Pseudomonas aeruginosa, thus confirming the bactericidal effect of the extract on Pseudomonas aeruginosa. Furthermore, the extract was also tested against brine shrimp for toxicity. The extract exhibited no significant toxicity (LC 50 ¼ 1.30 mg=mL) against Artemia salina L. (Artemiidae).

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“…In veterinary medicine, the biofilm producing capability of P. aeruginosa is most feared in cases of infections involving invasive devices or implants (Weese et al, 2008). P. aeruginosa is also a severe complicating factor in cases of equine ulcerative keratitis (Keller and Hendrix, 2005), in dermatitis, otitis externa and urinary tract infections in small animals (Rubin et al, 2008), in fleece rot in sheep (Kingsford and Raadsma, 1997), in bovine mastitis, which is often associated with contaminated udder washing water or contaminated intramammary dry-cow preparations (McLennan et al, 1997), and in hemorrhagic pneumonia in mink (Hammer et al, 2003).…”

Section: Pseudomonas Aeruginosamentioning

confidence: 99%

Quorum sensing in veterinary pathogens: Mechanisms, clinical importance and future perspectives

Boyen¹,

Eeckhaut²,

Immerseel³

et al. 2009

Veterinary Microbiology

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Under certain circumstances the individuals of a bacterial population may find advantages in acting together and making "collective decisions". This phenomenon is better known as quorum sensing. When the concentration of signal molecules produced by the surrounding bacteria exceeds a certain threshold, the bacterial population acts as a single organism, collectively expressing virulence genes, biofilm forming genes, etc. Several mechanisms of quorum sensing are discussed, each with its distinct signal molecules and respective receptors. Some of these mechanisms are restricted to sensing intraspecies signalling, but interspecies and even interkingdom signalling have also been described. Several veterinary pathogens such as Staphylococcus aureus, Staphylococcus pseudintermedius, Pseudomonas aeruginosa and Salmonella Typhimurium use quorum sensing as a means to optimize virulence gene expression and host colonization. Therefore, targeting of the QS mechanisms may provide a novel strategy for combating bacterial infections, also in veterinary medicine.

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The occurrence of Pseudomonas aeruginosa in fleece washings from sheep affected and unaffected with fleece rot

Cited by 13 publications

References 20 publications

Isolation and characterization of Pseudomonas aeruginosa from sheep with fleece rot in northern and middle Jordan

Isolation and characterization of Pseudomonas aeruginosa from sheep with fleece rot in northern and middle Jordan

Antibacterial Activity and Toxicity ofPsophocarpus tetragonolobus.

Quorum sensing in veterinary pathogens: Mechanisms, clinical importance and future perspectives

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